Which of the following factors that affect skin drag,can athletes usually alter?

Name: Which of the following factors that affect skin drag,can athletes usually alter?
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Question

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Athletes can usually alter the roughness of their body surface through clothing, body suits, or skin treatments, and they can also change the amount of surface area in contact with the fluid by adjusting their body position. They cannot typically alter the viscosity of the fluid they are moving in, such as water or air.

Which of the Following Factors That Affect Skin Drag,can Athletes